Expulsion-fuse circuit-breaker.



W. J. LIETZENMAYER.

EXPULSION FUSE CIRCUIT BREAKER.

APPLICATION FILED APR.15, 1907.

UNITED sTATEs PATENT oEEIoE.`

WILLIAM J. LIETZENMAYER,

OF WEBSTER, NEW YORK; ASSIGNOR T0 ALLIS-CHALMERS COMPANY, A CORPORATIONOFy NEW JERSEY, AND THE BULLOCK ELECTRIC MANU- FACTURIN G COMPANY, ACORPORATION OF OHIO.

EXPULSION-FUSE CIRCUIT-BREAKER.

To aZZ 'whom e't may concern Be it known that I, WILLIAM J. LIETZEN-MATER, a citizen of the United States, residing at I/Vebster, in thecounty of Monroe and lState of New York,`have invented certain new anduseful Improvements in Expulsion- F use Circuit-Breakers, of which thefollowing is a full, clear, and exact specification.

My invention relates to circuit interrupting devices.

In modern high tension electrical transmission systems specialprotect-ive apparatus isrequired, as the ordinary circuit-breakers arenot adapted to provide a separation between their terminals sutlicientto break the arcs which form. Moreover the ordinary circuit-breaker isso slow in acting that it allows current to continue long enough both todefeat the object of the circuit-breaker and to cause injury to thecircuit-breaker itself. These same objections apply even where simplefuses ar'e used.

It is the object of my present invention to provide an arrangementwhereby under abnormal conditions anelectric circuit will be`interrupted suticiently quickly and by a break sufficiently wide toprevent a continuance' ofthe current for any appreciable time.

It has been found that the pressure irgen-` erated by the blowing of aninclosed fuse is almost explosive in its nature, the pressureinstantaneously produced in the fuse chamber often becomes enormous. Inrmy device I aim to use the pressure suddenly develyoped by this blowingof the fuse to move to off position a circuit-breaker arm which is inseries with the fuse, thus obtaining an almost instantaneousinterruption 'of the circuit.

My invention therefore comprises the com- `bination of a fuse, and aSwitch arm arranged to be moved from one position to another by pressuregenerated by the blowing of said fuse.

Other features of my invention will appear from the description. andydrawings and will be particularly pointed out in the claims. Y

Figure 1 shows one embodiment of my `in'vention; and Fig. 2 shows aInodiication.

In Fig. 1 two high tension insulators 10 and 11 are mounted on a base12.v The upper insulator 11 carries a casing 13 provided Specication ofLetters Patent.

Patented Mar. `26, 1912.

' Application led'pril 15, 1907. Serial-l No. `368,184.

. C' y' l n .i wit-h-an outlet 14. Supported at the upper end of thecasing 13 is a sleeve'or bushing 1 5 of insulating material such asliber. A rlng 16 is a'ttached to the upper end of the sleeve 15andcarries a terminal 17 for connection to one side of the circuit. Afuse 18 extends from the ring 16 the bushing 15 and the chamber of thecasing 13 to the lower end of said casing, where p it is fastened asy bymeans of a screw 19. This forms an expulsion fuse.` An extension 20 fromthe lower end of the casing 13 forms a stationary .Contact whichcoperatcs with the blade 21 of a switch arm 22 suplengthwise through iported on the insulator 10. A wire 23 in conjunction. with a vshunt 23aconnects the blade 21 with the other' line terminal 24. Pivoted to theupper end of the arm 22 is a second arm 25 having an enlarged head 26which when the switch is closed lits over and closes the outlet 14 fromthe chamber within the casing 13. A spring 27 normally holds the arm 25in its extreme counter-clockwise position relative to the arm 22 andacts as a buffer to prevent too great shocks on the arm 22 when the arm25 is suddenly forced in a clockwise direction.

The circuit is complete from the terminal 17 to the terminal2ltl throughthe ring 16, fuse 18, casing'l, extension 20,'switch blade 2l, wire 23and shunt 23a. In case of an overload, whether the current bealternating, pulsating or direct, the fuse 18 blows. Since the fuse isin the comparativelysmall space of theV chamber within the casing 13which has-but one main outlet 14, a comparatively great pressure isgenerated by the blowing of the fuse and exerts itself through thisout-let upon the head 26, violently forcing this head and the arm 25 ina clockwise direction. This compresses the spring 27 and through Iitmoves the arm 22 quickly and almost violently'to the right, causing anearly instantaneous separation between the extension 20 and the switchblade 21. This separation is great enough to prevent any' continuance ofthe current and sudden enough to prevent any damage before thecircuit-breaker has operated. The distance of separation is furt-herincreased because the remnant'of the fuse 18 is blown suddenly 'out ofthe casing 13 through the small opening in the sleeve 15. The bufferspring 29 catches the arm 22.

' the extension 20. This prevents any accidental clockwise'movement ofthe arm 22. When the fuse 18 blows, moved to the right to first releasethe latch 30 and to then carry the arm 22 to the right to put a widerbreak in the circuit.

Many modifications inthe precise arrangements here shown and describedmay be made without departing from the spirit. and scope of my inventionand all such I aim to cover in the following claims.

lhat I claim as new is 1. In combination, a fuse, a casing inclosingsaid fuse and provided with an outlet, and a pivoted switch arm somounted relatively to said casing that when the arm is in one positionsaid outlet Closed and the switch the arm 25a is.

arm is movable from such position to an-` other position by pressuregeneratedin the casing upon the blowing of the fuse.

2. In combination, a fuse, a casing. therefor provided with an outlet,and a switch arm outside of said casing and provided with a part whichcloses said outlet when said arm is in a closed position.

3. In combination,- a fuse, a casing in which said fuse is mounted, saidcasing being provided with an outlet, and a pivoted switch arm in serieswith the fuse and so mounted that when it is in a closed position saidoutlet is closed by a portion of said arm and the switch arm will beblown to open position by the pressure generated .in said casing uponthe fusing of said fuse.

4. In an overload protective device, a fuse, a casingl therefor providedwith an outlet` and a switch arm outside of said casing-` and connectedin series with said fuse, 'said switch arm being mounted so that-.saidoutlet is closed thereby when the switch arm is in a closed position.

In combination, a switch arm, a latch for holding saidv switch arm 4inclosed position, a casing provided with an opening which is closed bysaid latch when the latter holds the switch arm in closed position, anda fuse in said casing, said fuse when it blows generating pressure whichalone releases said latch and forces said switch arm to open position.

(i. In an overload protective device, the ombination of a fuse, a casingin which said fuse .is mounted, said casing being provided with anoutlet, a swit/ch arm in series with the fuse, and a latch hinged to theswitch arm for holding it in closed position, said latch being mountedso that when it holds the switch arm in closed position it closes saidopening and is releasable by pressure generated in the casingl upon theblowing of the fuse.

kT. In an overload protective device, a switch arm, a latch for holdingsaid switch arm in closed position, a casing provided with an outletwhich is normally clof-'ed by said latch when the switch arm is inclosed position, and a fuse connected in series with said switch arm andmounted in said casing so that the pressure generated by the blowing ofthe fuse releases the latch and blows the switch arm out of said closedposition.

8. In combination, a fuse, a casing'therefor provided with a'n outlet, aswitch arm, a latch permanently secured to said arm and arranged to holdsaid switch arm in closed position, and a part attached to said latchand fitting over said outlet so that. the pressure generated by theblowing of the fuse alone releases the latch and moves the switch armaway from said closed position.

9. In an overload protective device, the combination of a fuse, aninclosing casing therefor provided with an'outlet, a switch arm inseries with said fuse, and a latch permanently secured to said switcharm for holding said switch arm in closed position, said latch beingmounted so that when *it holds the switch arm covered and the `latchwillbe released and the switch arm forced to open position by thepressure generated in said casing when said fuse blows.

10. In combination.,` an expulsion fuse, a-

casing therefor provided with an outlet, and a switch outside of saidcasing\and normally covering said outlet and in series with the saidcasing that itis forced open solely by the expulsion from said outlet ofgases generated by the blowing of the fuse.

In testimony whereof I aiiix my signature, in the presence of twowitnesses.

WILLIAM J. LIETZENMAYER.

Witnesses FLORENCE E. MAGCURY, FRED J. KINsEY.

closed said outlet isl

